Hi Hendrik,
one point I am not quite sure about is that you are using some of VTK's
rendering methods which are usually not used inside MITK.
The following VTK Classes have a kind of "alternative" in MITK:
-vtkImageActor (a combination of mapper and actor meant image rendering) -->
mitkImageVtkMapper2D does this job specialized for our purposes
-vtkRenderWindowInteractor and vtkInteractorStyleImage --> We have our own
mitkVtkInteractorStyle which should be used to enable proper MITK interaction
I am a little surprised that you are able to render everything correctly this
way. Maybe you could try to render everything using our replacements?
Furthermore, there is currently a bug regarding outline binary (contours)
shifts: http://bugs.mitk.org/show_bug.cgi?id=10996
This could be related to your issues.
Regards
Thomas
[mitk-users] Geometry issues on rendering a vtkContourWidget in a
QmitkStdMultiWidget
Hendrik Hachmann
Wed, 30 May 2012 00:54:52 -0700
Hi
I am trying to use the vtkContourWidget combined with a live wire algorithm
in a QmitkStdMultiWidget.
Thus I added the vtkContourWidget via a mitk::VtkWidgetRepresentation to the
data storage.
This is what I have done so far:
// Calculate a cost image from an slice extracted by the
mitk::ExtractImageFilter
// Get existing renderer from QmitkStdMultiWidget
vtkRenderWindow *renderWindow =
m_Ext->GetMitkView()->GetRenderWindow1()->GetVtkRenderWindow();
vtkRenderer *renderer =
m_Ext->GetMitkView()->GetRenderWindow1()->GetRenderer()->GetVtkRenderer();
vtkImageActor *actor = vtkImageActor::New();
actor->SetInput( image );
actor->SetDisplayExtent( 0, 511, 0, 511, 0, 0 );
vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
iren->SetRenderWindow( renderWindow );
vtkInteractorStyleImage* style = vtkInteractorStyleImage::New();
iren->SetInteractorStyle( style );
style->Delete();
// Contour widget for interactive path definition
vtkContourWidget *contourWidget = vtkContourWidget::New();
contourWidget->SetInteractor(iren);
contourWidget->SetFollowCursor(1);
mitk::VtkWidgetRendering::Pointer mWidget = mitk::VtkWidgetRendering::New();
mWidget->SetVtkWidget(contourWidget);
mWidget->Initialize();
mWidget->SetRenderWindow(m_Ext->GetMitkView()->GetRenderWindow1()->GetVtkRen
derWindow());
mWidget->Enable();
mWidget->Update();
mitk::DataNode::Pointer widgetNode = mitk::DataNode::New();
widgetNode->SetData(mWidget);
widgetNode->SetName("VtkContour");
m_Ext->GetDataStorage()->Add(widgetNode);
widgetNode->Update();
vtkOrientedGlyphContourRepresentation *rep =
vtkOrientedGlyphContourRepresentation::New();
contourWidget->SetRepresentation( rep );
contourWidget->SetFollowCursor( followCursor );
rep->GetLinesProperty()->SetColor(1, 0.2, 0);
rep->GetProperty()->SetColor(0, 0.2, 1);
rep->GetLinesProperty()->SetLineWidth( 3 );
// The contour rep requires a suitable point placer
vtkImageActorPointPlacer *placer = vtkImageActorPointPlacer::New();
placer->SetImageActor( actor );
rep->SetPointPlacer( placer );
// The line interpolator defines how intermediate points are
// generated between the representations nodes. This
// interpolator uses Dijkstra's shortest path algorithm.
vtkDijkstraImageContourLineInterpolator *interpolator =
vtkDijkstraImageContourLineInterpolator::New();
interpolator->SetCostImage( vCostImage );
vtkDijkstraImageGeodesicPath* path =
interpolator->GetDijkstraImageGeodesicPath();
path->StopWhenEndReachedOn();
// prevent contour segments from overlapping
path->RepelPathFromVerticesOn();
// weights are scaled from 0 to 1 as are associated cost
// components
path->SetCurvatureWeight( 0.15 );
path->SetEdgeLengthWeight( 0.8 );
path->SetImageWeight( 1.0 );
rep->SetLineInterpolator( interpolator );
contourWidget->EnabledOn();
renderWindow->Render();
renderer->ResetCamera();
iren->Initialize();
The code basically works. However, I encountered geometry issues. The region
in which the contour works as expected is shifted to the upper right and the
region is way to large.
In the mitkVtkWidgetRendering documentation is says: "Note: this class only
provides a basic mechanism for adding widget; all widget configuration such
as placement, size, and en-/disabling of interaction mechanisms need to be
done in the vtkWidget object."
The problem is I cannot find a geometry at the vtkWidget. I tried scaling
and shifting the actor as well as the vCostImage or changing the spacings
without success. Furthermore I tried to setup a geometry for the
mitk::VtkWidgetRendering.
So, how can I set the geometry correctly?
Can anyone help me?
Best regard,
Hendrik
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